The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 2003
Filed:
Sep. 28, 2000
Applicant:
Inventor:
Yu-Hung Sun, Taipei, TW;
Assignee:
Lite-On it Corporation, Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05B 5/00 ; H02H 7/08 ; H02P 1/00 ; H02P 3/00 ; H02P 7/00 ;
U.S. Cl.
CPC ...
G05B 5/00 ; H02H 7/08 ; H02P 1/00 ; H02P 3/00 ; H02P 7/00 ;
Abstract
The present invention proposes a method of detecting reverse rotation of a DC motor by using the back EMF, wherein the back EMF of the DC motor is detected to judge whether the brakeage of the motor is finished. A simple electronic circuit is exploited to accomplish this work effectively. No additional sensors are required so that the cost can be reduced.